Ruby on rails use devise display error on heroku -

i'm trying deploy app on heroku, there error.

i've tried add require 'devise' in config/application.rb didn't work.

link project on github: https://github.com/qjpioneer/12in12-blog

gemfile

source 'https://rubygems.org'   # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '~> 5.0.0', '>= 5.0.0.1' # use sqlite3 database active record  group :development   gem 'sqlite3' end group :production   gem 'pg'   gem 'rails_12factor' end # use puma app server gem 'puma', '~> 3.0' # use scss stylesheets gem 'sass-rails', '~> 5.0' # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0' # use coffeescript .coffee assets , views gem 'coffee-rails', '~> 4.2' # see https://github.com/rails/execjs#readme more supported runtimes # gem 'therubyracer', platforms: :ruby  # use jquery javascript library gem 'jquery-rails' # turbolinks makes navigating web application faster. read more: https://github.com/turbolinks/turbolinks gem 'turbolinks', '~> 5' # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.5' # use redis adapter run action cable in production # gem 'redis', '~> 3.0' # use activemodel has_secure_password # gem 'bcrypt', '~> 3.1.7'  # use capistrano deployment # gem 'capistrano-rails', group: :development  group :development, :test   # call 'byebug' anywhere in code stop execution , debugger console   gem 'byebug', platform: :mri end  group :development   # access irb console on exception pages or using <%= console %> anywhere in code.   gem 'web-console'   gem 'listen', '~> 3.0.5'   # spring speeds development keeping application running in background. read more: https://github.com/rails/spring   gem 'spring'   gem 'devise'   gem 'spring-watcher-listen', '~> 2.0.0' end  # windows not include zoneinfo files, bundle tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby] 

error after git push heroku master

counting objects: 73, done. delta compression using 4 threads. compressing objects: 100% (69/69), done. writing objects: 100% (73/73), 518.43 kib | 0 bytes/s, done. total 73 (delta 41), reused 0 (delta 0) remote: compressing source files... done. remote: building source: remote:  remote: -----> ruby app detected remote: -----> compiling ruby/rails remote: -----> using ruby version: ruby-2.2.4 remote: -----> installing dependencies using bundler 1.11.2 remote:        running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment remote:        fetching gem metadata https://rubygems.org/.......... remote:        fetching version metadata https://rubygems.org/... remote:        fetching dependency metadata https://rubygems.org/.. remote:        using concurrent-ruby 1.0.2 remote:        using i18n 0.7.0 remote:        using minitest 5.9.0 remote:        using thread_safe 0.3.5 remote:        using builder 3.2.2 remote:        using erubis 2.7.0 remote:        using mini_portile2 2.1.0 remote:        using pkg-config 1.1.7 remote:        using rack 2.0.1 remote:        using nio4r 1.2.1 remote:        using websocket-extensions 0.1.2 remote:        using mime-types-data 3.2016.0521 remote:        using arel 7.1.2 remote:        using json 2.0.2 remote:        using mimemagic 0.3.2 remote:        using coffee-script-source 1.10.0 remote:        using execjs 2.7.0 remote:        using method_source 0.8.2 remote:        using thor 0.19.1 remote:        installing rake 11.3.0 remote:        installing bcrypt 3.1.11 native extensions remote:        using multi_json 1.12.1 remote:        using subexec 0.2.3 remote:        using pg 0.18.4 remote:        using puma 3.6.0 remote:        using bundler 1.11.2 remote:        using rails_serve_static_assets 0.0.5 remote:        using rails_stdout_logging 0.0.5 remote:        using sass 3.4.22 remote:        using tilt 2.0.5 remote:        using turbolinks-source 5.0.0 remote:        using tzinfo 1.2.2 remote:        using nokogiri 1.6.8 remote:        using websocket-driver 0.6.4 remote:        using mime-types 3.1 remote:        using rack-test 0.6.3 remote:        installing orm_adapter 0.5.0 remote:        using sprockets 3.7.0 remote:        using coffee-script 2.4.1 remote:        using uglifier 3.0.2 remote:        using mini_magick 3.8.0 remote:        using rails_12factor 0.0.3 remote:        using turbolinks 5.0.1 remote:        using activesupport 5.0.0.1 remote:        using loofah 2.0.3 remote:        using mail 2.6.4 remote:        using rails-dom-testing 2.0.1 remote:        using globalid 0.3.7 remote:        using activemodel 5.0.0.1 remote:        using jbuilder 2.6.0 remote:        using rails-html-sanitizer 1.0.3 remote:        using activejob 5.0.0.1 remote:        using activerecord 5.0.0.1 remote:        using carrierwave 0.11.2 remote:        using actionview 5.0.0.1 remote:        using actionpack 5.0.0.1 remote:        using actioncable 5.0.0.1 remote:        using actionmailer 5.0.0.1 remote:        using railties 5.0.0.1 remote:        using sprockets-rails 3.2.0 remote:        using coffee-rails 4.2.1 remote:        installing warden 1.2.6 remote:        using jquery-rails 4.2.1 remote:        using rails 5.0.0.1 remote:        using sass-rails 5.0.6 remote:        installing responders 2.3.0 remote:        installing devise 4.2.0 remote:        bundle complete! 21 gemfile dependencies, 67 gems installed. remote:        gems in groups development , test not installed. remote:        bundled gems installed ./vendor/bundle. remote:        bundle completed (6.31s) remote:        cleaning bundler cache. remote:        removing rake (11.2.2) remote: -----> preparing app rails asset pipeline remote:        running: rake assets:precompile remote:        rake aborted! remote:        sass::syntaxerror: file import not found or unreadable: bootstrap-sprockets. remote:        (sass):17 remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:67:in `rescue in import' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:45:in `import' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:28:in `imported_file' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:37:in `css_import?' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:313:in `visit_import remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `block in visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:79:in `block in with_base' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:115:in `with_frame' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:79:in `with_base' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `block in visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `map' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:169:in `block in visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:181:in `with_environment' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:168:in `visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `block in visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:188:in `visit_root' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:159:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:8:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/root_node.rb:36:in `css_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/root_node.rb:20:in `render' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/engine.rb:281:in `render' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:48:in `call' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:28:in `call' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `yield' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:185:in `compile' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/rake/sprocketstask.rb:147:in `with_logger' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/rake-11.3.0/exe/rake:27:in `<top (required)>' remote:        sass::syntaxerror: file import not found or unreadable: bootstrap-sprockets. remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:65:in `import' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:28:in `imported_file' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/import_node.rb:37:in `css_import?' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:313:in `visit_import remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `block in visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:79:in `block in with_base' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:115:in `with_frame' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/stack.rb:79:in `with_base' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:160:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `block in visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `map' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:52:in `visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:169:in `block in visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:181:in `with_environment' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:168:in `visit_children' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `block in visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:188:in `visit_root' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/base.rb:36:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:159:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/visitors/perform.rb:8:in `visit' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/root_node.rb:36:in `css_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/tree/root_node.rb:20:in `render' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sass-3.4.22/lib/sass/engine.rb:281:in `render' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:48:in `call' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/sass_compressor.rb:28:in `call' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `yield' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:185:in `compile' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/rake/sprocketstask.rb:147:in `with_logger' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define' remote:        /tmp/build_e0078c6c5e92289f77b7a5fa93263a6a/vendor/bundle/ruby/2.2.0/gems/rake-11.3.0/exe/rake:27:in `<top (required)>' remote:        tasks: top => assets:precompile remote:        (see full trace running task --trace) remote:  ! remote:  !     precompiling assets failed. remote:  ! remote:  !     push rejected, failed compile ruby app. remote:  remote:  !     push failed remote: verifying deploy... remote:  remote: !   push rejected lit-cliffs-80047. remote:  https://git.heroku.com/lit-cliffs-80047.git  ! [remote rejected] master -> master (pre-receive hook declined) error: failed push refs 'https://git.heroku.com/lit-cliffs-80047.git' 

i don't see gem bootstrap-sass in gemfile. put gem 'bootstrap-sass'in gemfile , bundle. should fix problem.